[Ips-dhfpr] ASWFC Daily HF Prop Report - 26 March 25 issued 2330 UT on 26 Mar 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/26 MARCH 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (26 MARCH) 
Date   T index  Conditions    
26 Mar   113    Fair           

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    0810UT  possible   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Depressed by 20%.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 35% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Feb      127
Mar      117
Apr      114


2. FORECAST (27 MARCH - 29 MARCH)
Date   T index  Conditions       MUFs                              
27 Mar   100    Fair             Depressed 15 to 20%/near predicted 
                                 monthly values
28 Mar   100    Fair             Depressed 10 to 15%/near predicted 
                                 monthly values    
29 Mar   130    Fair-normal      Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 31 was issued on 26 
March and is current for 27 Mar only. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 25-Mar were depressed 
20% to near predicted values, with depressions observed in the 
southern Australian region. Spread-F was observed in Hobart and 
Canberra during local night hours. Southern Australian region 
MUFs are expected to be 10-20% depressed over 27-Mar to 28-Mar. 
HF communicators with ionospheric reflection points in the southern 
Australian/NZ region should use a T-index of 70 on 27-Mar. Northern 
Australian region MUFs are expected to remain near predicted 
monthly values to 15% enhanced.

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For an explanation of some of the terms in this report, go to
https://www.sws.bom.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.

Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au